What term best describes a building that contains nothing?

The term "vacant" precisely describes a building that contains nothing. In property terminology, "vacant" refers to a space that is not currently being occupied or utilized, and it specifically indicates an absence of people and possessions within the structure. This term is commonly used in real estate to describe properties that are not currently being leased or lived in.

In contrast, "unoccupied" suggests that while the building may not have people inside at the moment, it could still be furnished or have other uses associated with it. "Abandoned" implies that the building has been left behind, often in a state of neglect, which brings connotations about the property's condition and the intent of leaving it. "Idle" typically refers to something that is not in use, but it does not specifically address the status of contents within a building. Thus, "vacant" is the most accurate term for describing a building that is completely empty of occupants and belongings.